Hi, you can buy dipping solutions and some people
use chemicals like acetone to clean their coins but before you embark on
cleaning you must be 100% sure that your coins do need cleaning as
damage resulting in unnecessary or improper cleaning can wipe a large
percentage of the value from a coin. I have a small page on my website
devoted to coin cleaning which may help you. www.coinwiki.co.uk

I
will advice you to be very cautious about cleaning coins and to
practice on coins with little or no value before trying it out on coins
you want to keep. If you have any more questions just ask.

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